As a preamble to a potential talk and some videos on subtle aspects of game design, I decided to take a look at 3 games which I think are exemplary of non-verbal communication through game design: The Witness, Stephen's Sausage Roll, and Dark Souls (3 in this particular case).
If you like The Witness, you might like a puzzle game I'm currently making. It's called Taiji and you can learn a bit more about it here: http://taiji-game.com/about
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https://www.youtube.com/watch?v=LKs5D9mVHNo